Study On Mineralization Process And Collision Attachment Mechanism In Fluidized Bed

For countercurrent mineralization,the turbulent flow is uniform,the energy consumption is small,the collision strength is small,the mineralization efficiency and recovery rate are low,while the impeller stirring mineralization and jet mineralization have uneven slurry turbulence intensity,high energy consumption and turbulence.Individually adjusted according to feeding property.A novel mineralization method for turbulence intensity and collision strength required to adapt to different flotation feed properties was proposed by changing the properties of the filled particles.This study focuses on fluidized bed mineralization process and collision attachment mechanism.In this paper,the influence of different turbulent environments formed under different operating conditions in the fluidized bed flotation column on the diameter of the bubble is the cut-in.This law is used to carry out flotation experiments of different granular grades of coal slime,and to explore the effect of different turbulent environments on the flotation of different grades of slime.Finally,the classical model studied by the predecessors is used to theoretically analyze the interaction between bubbles and particles,and compared with previous experiments.In the research process of bubble diameter and bubble rising velocity in the fluidized bed flotation column,the method of measuring the diameter of the bubble by the conductivity probe is used to clarify the distribution law of the bubble diameter.Then use the classic model to calculate the bubble rising speed,and clarify the change law of bubble rising speed.Adjusting the appropriate superficial liquid velocity and bed packed height has obvious shearing effect on the bubble.At higher superficial liquid velocity,the superficial gas velocity has no significant effect on the bubble diameter.When the height of the packed bed is 0.289 m and the superficial liquid velocity is 0.226m/s,the bubble diameter is 0.63 mm,and the bubble diameter is the smallest at this time.The equation for calculating the rising velocity of the bubble in the intermediate flow state and the Reynolds number of the bubble are in agreement with the data of this test.The apparent water velocity and the height of the packed bed have a great influence on the diameter of the bubble.The study on the flotation effect of different size coal slime found that adjusting the superficial liquid velocity is beneficial to change the flotation effect of different granular grade slime.The increase of superficial liquid velocity is very effective for the flotation of finer grade coal slime.When the superficial liquid velocity is 0.226m/s,the bubble diameter is the smallest,and the coarse coal has the largest yield of clean coal.Adjusting the height of the packed bed is beneficial to changing the flotation effect of the slime.The yield of clean coal at a height of 0.289 m of the packed bed has a maximum.Theoretical analysis of collision attachment between flotation particles and bubbles found that particle size is the main parameter affecting the collision probability and collection probability.When the height of the packed bed is 0.289 m and the superficial liquid velocity is 0.226m/s,the collision probability and the collection probability have the maximum.It is verified from the side that it is beneficial to change the flotation effect of different size coal slime by adjusting the superficial liquid velocity.The proper packed bed height is very effective for improving the slime flotation efficiency.In the fluidized bed flotation column,the appropriate superficial liquid velocity and bed packed height can be adjusted to construct turbulent intensity and collision strength suitable for different feed properties.The research results have certain theoretical and practical significance for further optimizing the fluidized bed flotation column operation and structural design of the packed bed.